India, April 21 -- Canadian stocks tumbled on Tuesday as the delay in the scheduled peace talks between the U.S. and Iran triggered escalation concerns as the two-week ceasefire in the ongoing gulf war is set to end tomorrow night.

After opening a little lower than yesterday's close, today the benchmark S&P/TSX Composite Index regained ground but lost the momentum to trade firmly negative before settling at 33,808.30, down by 551.73 points (or 1.61%).

Only two of the 11 sectors posted gains today, with the energy sector leading the pack.

In the ongoing U.S.-Iran conflict that began on February 28, the standoff on peace talks continued to dictate market movements.

The two-week ceasefire in the U.S.-Iran conflict, announced early in April...